At the A1 level, you are just starting to learn how to describe things. You probably already know the word 'fraco,' which means 'weak.' The word 'débil' is a slightly more advanced way to say 'weak' or 'faint.' You can think of it as a word to describe things that are not strong. For example, if a light is very dim and hard to see, you can call it a 'luz débil.' If a person is very old or sick and doesn't have much energy, you can say they are 'débil.' At this stage, you don't need to use 'débil' all the time, but you should recognize it when you see it in a book or hear it on the news. It is most commonly used for health and for light or sound. Remember that it doesn't change if you are talking about a boy or a girl—it's always 'débil.' Just focus on the idea of 'low energy' or 'low power.' If you see a candle that is about to go out, that is a 'débil' flame. If you hear a very quiet whisper, that is a 'débil' sound. It is a useful word to add to your vocabulary once you feel comfortable with basic adjectives like 'grande,' 'pequeno,' 'forte,' and 'fraco.' Learning 'débil' helps you sound a little more specific when you describe the world around you.
At the A2 level, you should begin to distinguish between different types of 'weakness.' While 'fraco' is your go-to word for 'weak,' 'débil' is used when you want to describe something that is fragile, faint, or lacks intensity. You will often see this word in short stories or news articles. For example, a 'saúde débil' (weak health) is a common phrase. It describes someone who gets sick easily or is very frail. You should also know the plural form: 'débeis.' If you are talking about two weak lights, you say 'luzes débeis.' Notice how the 'il' changes to 'eis.' This is a common pattern for adjectives in Portuguese that have the stress on the second-to-last syllable. You might also hear 'débil' in the context of technology, like a 'sinal débil' (weak signal) on your phone. At this level, try to use 'débil' when you are talking about physical things like light, sound, and health. It makes your Portuguese sound more varied. Don't worry about using it for abstract ideas like 'weak arguments' yet; focus on the physical world. Also, be careful not to use it for food—you wouldn't say 'débil' for a weak coffee; stick with 'fraco' for that.
By the B1 level, you are moving into more abstract and formal territory. You should be comfortable using 'débil' to describe not just physical weakness, but also lack of vigor in systems or ideas. For instance, you might read about 'crescimento econômico débil' (weak economic growth) in a newspaper. This shows that the word is common in professional and journalistic settings. You should also understand the nuance that 'débil' often implies an inherent fragility. If a structure is 'débil,' it might fall down because it was not built strongly. If a person's resolve is 'débil' (vontade débil), they might give in to temptation easily. At B1, you should also be aware of the word's history. Avoid using it to describe intelligence, as 'débil mental' is an old, offensive term. Instead, use 'débil' to add precision to your descriptions of intensity. Is the light just 'fraca' (weak), or is it 'débil' (faint and flickering)? Choosing 'débil' adds a layer of descriptive detail to your writing. You should also be able to use it correctly with 'ser' and 'estar.' 'Ele é débil' means he is a naturally frail person, while 'Ele está débil' means he is currently weak, perhaps because of a recent illness.
At the B2 level, you should use 'débil' with confidence in formal writing and academic contexts. You understand that 'débil' is a more sophisticated alternative to 'fraco' and carries a connotation of 'tenuous' or 'insubstantial.' You can use it to critique arguments: 'O autor apresenta uma tese débil, sem provas concretas' (The author presents a weak thesis, without concrete evidence). Here, 'débil' suggests that the argument lacks the necessary logical strength to be convincing. You should also be able to identify collocations like 'ponto débil' (weak point/weakest link). In a business or technical report, you might describe a 'conexão débil' or a 'desempenho débil' (weak performance). At this level, you should also appreciate the poetic use of the word in literature. A 'débil claridade' (faint brightness) at dawn creates a specific mood. You can also use the word to describe social or political structures, such as a 'coligação débil' (a weak political coalition) that is likely to break apart. Your understanding of the word should now include its ability to describe anything that lacks the necessary power, intensity, or stability to function effectively or resist pressure.
At the C1 level, your use of 'débil' should be nuanced and precise. You understand the subtle differences between 'débil,' 'ténue,' 'frágil,' and 'debilitado.' You use 'débil' to describe conditions of inherent lack of vigor or low intensity that require careful observation or support. In your writing, you might use it to describe the 'débil fronteira' (tenuous border) between two complex ideas or the 'débil equilíbrio' (fragile balance) of an ecosystem. You are fully aware of the sociolinguistic implications of the word, including its dated medical uses, and you navigate these with sensitivity. You can use 'débil' in complex metaphorical ways, such as describing a 'débil memória' of a distant event. Your pronunciation and grammar are perfect, including the plural 'débeis' and the correct stress on the first syllable. You can also use the word to describe subtle physical sensations, like a 'débil aragem' (a faint breeze) that barely stirs the leaves. At this level, 'débil' is a tool for precision, allowing you to avoid the overused 'fraco' and instead provide a specific description of something that is faint, fragile, or lacks the necessary substance to be considered 'forte' or 'robusto.'
At the C2 level, you have a masterly command of 'débil' and its place in the history of the Portuguese language. You can interpret its use in classical literature, such as the works of Camilo Castelo Branco or Eça de Queirós, where it often describes the 'débil' constitution of romantic or tragic figures. You understand the word's etymological journey from Latin and how it relates to other Romance languages. In your own production, you use 'débil' to convey a sense of 'existential fragility' or 'structural insufficiency' in highly formal or philosophical discourses. You might discuss the 'débil natureza' of human certainty or the 'débil legitimidade' of a historical regime. You are also adept at using the word in technical fields, such as physics or engineering, to describe 'interações débeis' (weak interactions) or 'estruturas débeis.' Your command of the word is such that you can use it to create specific stylistic effects, such as using it in an unusual position for poetic emphasis. 'Débil' is no longer just a word for 'weak' to you; it is a versatile instrument for describing the myriad ways in which things can lack intensity, strength, or durability in the physical and abstract worlds.

The Portuguese word débil is a versatile adjective that primarily functions as a descriptor for lack of strength, intensity, or vigor. Derived from the Latin debilis, it shares the same root as the English word 'debilitated.' In its most literal sense, it describes a physical state of being weak or frail. When you encounter this word in a medical or biological context, it often refers to a person whose health is compromised or whose constitution is naturally fragile. However, the application of débil extends far beyond the human body. It is frequently used to describe physical phenomena that lack power. For example, a light that is flickering or faint is often called a luz débil, and a sound that is barely audible is a som débil. In the abstract realm, it can describe arguments, economies, or structures that lack a solid foundation or convincing power.

Physical Frailty
Used to describe a body or health condition that is not robust. It suggests a vulnerability to illness or a general lack of muscular or systemic power.

Após a longa enfermidade, o paciente ainda se sentia extremamente débil para caminhar sozinho.

Historically, débil was part of the clinical phrase débil mental, used to describe intellectual disabilities. It is crucial for modern learners to understand that this specific usage is now considered highly offensive, pejorative, and scientifically outdated in the Lusophone world. Just as 'feeble-minded' has been removed from polite and professional English, débil mental has been replaced by terms like deficiência intelectual. When using débil today, stick to physical, environmental, or structural contexts to avoid unintended offense. In literature, you might see it used to describe the 'weak' light of dawn or the 'feeble' pulse of a dying character. It carries a certain poetic weight that the more common word fraco (weak) sometimes lacks.

Intensity and Magnitude
Applied to light, sound, or signals. A sinal de rádio débil indicates a poor connection or low signal-to-noise ratio.

A vela projetava uma chama débil contra as paredes escuras da caverna.

In economic and political discourse, débil is a frequent guest. You might read about crescimento econômico débil (weak economic growth) in a newspaper like 'Público' or 'Folha de S. Paulo.' In these contexts, it signifies a lack of momentum or robustness. An argumento débil is one that is easily dismantled or lacks supporting evidence. The word provides a more sophisticated alternative to fraco in formal writing. It suggests a thinness or a lack of substance. For instance, a coligação débil (weak coalition) in parliament suggests a political alliance that might collapse at any moment due to its inherent fragility.

O governo apresentou uma justificativa débil para o aumento dos impostos.

Structural Integrity
Used to describe physical objects or systems that are likely to break or fail under pressure. A ponte débil would be a dangerous crossing.

As fundações da casa antiga eram demasiado débeis para suportar um segundo andar.

Finally, the word often appears in philosophical or literary discussions about the human condition. A vontade débil refers to a person who lacks resolve or 'weak will.' This usage explores the internal psychological state rather than external physical strength. When you use débil, you are often choosing a word that carries a sense of empathy or clinical observation, rather than just a simple judgment of strength. It is a word that requires context to determine if it is describing a flickering candle, a recovering patient, or a flawed logical premise.

Sua resistência era débil perante tamanha tentação.

Using débil correctly requires an understanding of its position as a more formal and precise alternative to fraco. In Portuguese, adjectives usually follow the noun, and débil is no exception. However, its placement can sometimes shift to before the noun in literary contexts to add emphasis or a poetic touch. For example, uma débil esperança (a faint hope) sounds more evocative than uma esperança débil. When describing health, it is often paired with the verb estar (to be - temporary state) or ser (to be - permanent/characteristic state), depending on whether the weakness is a result of a current condition or an inherent trait.

Describing Physical States
Focus on the lack of energy or health. It is common in hospital settings or when discussing the elderly.

O recém-nascido nasceu débil, mas recuperou rapidamente na incubadora.

When applying débil to inanimate objects or abstract concepts, the word highlights a deficiency in power or effectiveness. In technical fields, you might talk about a conexão débil (weak connection) or a sinal de Wi-Fi débil. In these cases, débil functions as a synonym for 'poor' or 'low-quality.' In academic writing, you might critique a theory by calling its evidence débil. This implies that the evidence is not just 'weak' but perhaps insufficient or unsubstantiated. The word adds a layer of formal criticism that fraco might not convey as effectively.

Sensory Descriptions
Use 'débil' to describe things that are hard to perceive because they lack intensity.

Ouvimos um batimento débil vindo de trás da porta trancada.

In the plural form, débeis, the stress remains on the first syllable. This is important for pronunciation. For example, os reflexos débeis (weak reflexes) or as luzes débeis (faint lights). Notice how the adjective does not change for gender: o sinal débil (masculine) and a luz débil (feminine). This makes it easier for learners to use without worrying about gender agreement, though numerical agreement is still required. In metaphors, débil can represent the underdog or the vulnerable part of a system, such as o elo mais débil (the weakest link).

Identificamos os pontos débeis na segurança do edifício.

Economic and Abstract Usage
Describes systems or concepts that lack vigor, growth, or persuasive force.

A economia do país permanece débil apesar das novas reformas.

To master débil, practice using it in sentences where 'weak' feels too simple. If you are describing a faint breeze, um vento débil sounds more descriptive than um vento fraco. If you are describing a person who is very fragile and thin, uma figura débil creates a more vivid image of vulnerability. The word often carries a tone of fragility that suggests something might break or disappear if not handled with care. This nuance is key to moving from basic to intermediate and advanced levels of Portuguese.

A sua voz débil mal conseguia ser ouvida acima do barulho da chuva.

You will encounter débil in several specific contexts in the Lusophone world. First and foremost, it is a staple of news reporting and formal journalism. When financial analysts discuss the stock market or national economies, they often use débil to describe stagnant growth or a lack of investment. If you listen to Portuguese radio or watch news channels like RTP or TVI, you will hear phrases like investimento débil or recuperação débil. This usage highlights the word's role in professional and academic registers, where precision is valued over commonality.

In Literature and Poetry
Authors use 'débil' to create atmosphere, describing fading light, fragile characters, or tenuous emotions.

Na literatura de Eça de Queirós, personagens de saúde débil são frequentemente retratadas.

In a medical or health-related context, although doctors use more specific terms today, you will still hear débil in conversations about the elderly or those with chronic illnesses. A family member might say, 'A minha avó está muito débil' (My grandmother is very frail). Here, the word conveys a sense of tenderness and concern that the more blunt fraco might lack. It describes a state of being that requires care and attention. You will also find it in historical documents and older literature, where it was used more broadly to describe any lack of strength, whether physical or moral.

Technical and Scientific Reports
Used to describe low-intensity signals, weak chemical bonds, or fragile ecological systems.

O relatório descreve o ecossistema local como extremamente débil e em risco.

In Brazil, you might hear débil in legal or administrative contexts. For example, a lawyer might argue that the evidence against their client is débil. This is a common part of legal jargon, signifying that the prosecution's case lacks the necessary strength to secure a conviction. Similarly, in corporate environments, a manager might describe a project's progress as débil if it is not meeting expectations. It serves as a professional way to deliver criticism without being overly aggressive, emphasizing the lack of results rather than the failure of individuals.

O sinal de rádio era tão débil que não conseguimos decifrar a mensagem.

Daily Life and Weather
Describing a light drizzle (chuva débil) or a soft breeze (vento débil) during a weather forecast.

Uma luz débil entrava pela fresta da janela ao amanhecer.

In summary, débil is a word of the 'middle register' and above. It is common enough to be understood by everyone but formal enough to be the preferred choice in writing, news, and professional assessments. Whether describing the flickering of a dying star, the fragile health of a patient, or the tenuous logic of a political argument, débil provides a specific shade of 'weakness' that implies fragility, low intensity, and a need for support or reinforcement. Paying attention to its use in these contexts will greatly enhance your comprehension of formal Portuguese.

A estrutura da ponte revelou-se demasiado débil para o tráfego pesado.

One of the most frequent mistakes learners make with débil is using it in contexts where the more common fraco is required. While both mean 'weak,' débil has a specific nuance of frailty or low intensity. For example, you wouldn't usually say 'este café é débil' (this coffee is weak); instead, you would use 'este café está fraco.' Débil is reserved for things that are inherently fragile or lack physical/sensory power. Using it for food or beverages sounds unnatural and overly clinical. Another common error is failing to form the plural correctly. The plural of débil is débeis, not débils. Remembering the -il to -eis shift is crucial for adjectives ending in unstressed -il.

The Pejorative Trap
Avoid the phrase 'débil mental'. Even if you see it in older texts, using it today is considered a major social faux pas and is offensive to people with disabilities.

Incorreto: Ele é um débil mental. (Ofensivo)
Correto: Ele tem uma deficiência intelectual.

Learners also struggle with the gender of débil. Unlike many Portuguese adjectives that end in -o or -a, débil is invariable for gender. It is o homem débil and a mulher débil. Many students mistakenly try to create a feminine form like débila, which does not exist. Another nuance is the difference between ser débil and estar débil. Ser débil implies an inherent, permanent state (e.g., a naturally fragile constitution), whereas estar débil implies a temporary state (e.g., being weak after a flu). Confusing these two can change the meaning of your sentence significantly.

Overuse in Casual Conversation
Using 'débil' when 'fraco' or 'ruim' would suffice can make you sound like you're reading from a textbook rather than speaking naturally.

Incorreto: O sinal da TV está débil. (Too formal for home)
Comum: O sinal da TV está fraco/ruim.

Finally, there is the confusion with the word debilitado. While related, debilitado is a past participle used almost exclusively for health and physical states (e.g., 'O atleta está debilitado'). You wouldn't call a light debilitada; it must be débil. Understanding that débil is the adjective for 'weak/faint' in a general sense, while debilitado specifically means 'weakened by something,' will help you sound more like a native speaker. Avoid using débil to describe a person's character or personality unless you mean they lack willpower (vontade débil); using it to mean 'stupid' is part of the pejorative usage mentioned earlier.

Correto: A luz da lanterna estava débil porque as pilhas estavam acabando.

Pluralization Mistake
Remember that adjectives ending in -il with the stress on the penultimate syllable change to -eis in the plural.

Incorreto: Os argumentos débils foram rejeitados.
Correto: Os argumentos débeis foram rejeitados.

By avoiding these common pitfalls—misapplying the word to food, using offensive historical phrases, failing to use the correct plural, and confusing it with debilitado—you will use débil with the precision and grace of a highly proficient Portuguese speaker. Always consider the 'intensity' of the weakness you are describing; if it's faint, fragile, or tenuous, débil is likely the right choice.

A criança tinha uma constituição débil e precisava de cuidados extras.

To truly master the concept of 'weakness' in Portuguese, it is essential to compare débil with its many synonyms and alternatives. Each word carries a slightly different weight and is used in specific contexts. While débil emphasizes frailty and low intensity, other words might emphasize lack of physical strength, lack of durability, or lack of moral conviction. Understanding these differences will allow you to choose the most appropriate word for every situation.

Débil vs. Fraco
'Fraco' is the most common and versatile word. It can describe a person, a drink, a battery, or a performance. 'Débil' is more formal and usually refers to health (frailty) or physical phenomena (faint light/sound).
Débil vs. Frágil
'Frágil' means fragile or breakable. While a 'débil' person is weak, a 'frágil' object (like glass) is easily broken. In health, 'frágil' suggests a high risk of injury or collapse.
Débil vs. Ténue
'Ténue' (tenuous/thin) is often a better choice for describing very slight differences, thin lines, or faint hopes. It is even more literary than 'débil'.

O paciente estava débil (physically weak), enquanto o vaso era frágil (easily broken).

Other alternatives include raquítico (rickety/emaciated), used for extreme physical thinness and weakness often due to malnutrition; debilitado (debilitated), used for someone who has been weakened by a specific cause like surgery; and frouxo (loose/weak), which can describe a loose knot or a person who lacks courage or 'spine.' In the context of light, instead of débil, you might use pálido (pale) or mortiço (dying/dim). Luz mortiça is a very common literary way to describe a light that is about to go out.

Débil vs. Debilitado
'Débil' is an inherent or current quality. 'Debilitado' is a state resulting from an action or event (e.g., 'He was debilitated by the fever').

A luz débil das estrelas guiava os viajantes na noite escura.

When discussing arguments or logic, you might use inconsistente (inconsistent) or insustentável (unsustainable/untenable) instead of débil. While a argumento débil is just weak, an argumento insustentável cannot be defended at all. In the business world, anémico (anemic) is sometimes used metaphorically to describe very weak growth (e.g., crescimento anémico), which is even more evocative than crescimento débil. By expanding your vocabulary with these alternatives, you can tailor your Portuguese to be as precise and expressive as possible.

A sua saúde débil impedia-o de viajar para climas tropicais.

Débil vs. Efémero
'Efémero' means ephemeral or short-lived. A 'débil' connection might last a long time but be poor quality; an 'efémero' moment is gone in an instant.

In conclusion, while débil is a powerful and useful word, it is part of a larger family of terms used to describe lack of strength. By comparing it to fraco, frágil, ténue, and debilitado, you gain a deeper understanding of when to use it for maximum impact. Whether you are describing a flickering candle, a fragile economy, or a person's health, choosing the right synonym will make your Portuguese sound more natural and sophisticated.

O som débil do sino ecoava pelo vale silencioso.

Examples by Level

1

A luz da sala está muito débil.

The light in the room is very faint.

Débil describes the noun 'luz'.

2

O bebê é um pouco débil.

The baby is a bit weak.

Débil is used for health here.

3

Eu ouço um som débil.

I hear a faint sound.

Débil means 'quiet' or 'faint' here.

4

A planta está débil sem água.

The plant is weak without water.

Estar is used for a temporary state.

5

O sinal de rádio é débil aqui.

The radio signal is weak here.

Débil describes the intensity of the signal.

6

Ela tem uma voz débil.

She has a weak voice.

Débil is a feminine/masculine adjective.

7

O sol de inverno é débil.

The winter sun is weak.

Débil describes the lack of heat/light.

8

O velho homem está débil.

The old man is feeble.

Débil refers to physical frailty.

1

As luzes débeis da cidade brilhavam ao longe.

The faint lights of the city shone in the distance.

Débeis is the plural of débil.

2

Ele tem uma saúde muito débil desde criança.

He has had very weak health since he was a child.

Saúde débil is a common collocation.

3

O Wi-Fi nesta sala é muito débil.

The Wi-Fi in this room is very weak.

Débil is used for technical signals.

4

A ponte é débil e não suporta carros.

The bridge is weak and doesn't support cars.

Débil describes structural weakness.

5

Sentimos um batimento cardíaco débil.

We felt a weak heartbeat.

Débil describes low physical intensity.

6

O vento débil mal movia as folhas.

The faint breeze hardly moved the leaves.

Débil describes low wind speed.

7

A chama da vela era muito débil.

The candle flame was very weak.

Débil describes a small flame.

8

Eles são débeis e precisam de ajuda.

They are weak and need help.

Plural agreement with 'eles'.

1

O país apresenta um crescimento econômico débil.

The country shows weak economic growth.

Débil is used in formal economic contexts.

2

O argumento dele é débil e fácil de refutar.

His argument is weak and easy to refute.

Débil describes a lack of logic or evidence.

3

A coligação política é demasiado débil para durar.

The political coalition is too weak to last.

Débil describes a fragile alliance.

4

Senti uma débil esperança de encontrar as chaves.

I felt a faint hope of finding the keys.

Débil is used metaphorically for emotions.

5

O sinal de socorro era demasiado débil para ser ouvido.

The distress signal was too weak to be heard.

Débil emphasizes the lack of power.

6

A estrutura do prédio revelou pontos débeis.

The building's structure revealed weak points.

Pontos débeis means 'weak points'.

7

A resistência do inimigo foi débil.

The enemy's resistance was weak.

Débil describes a lack of effort or force.

8

Ela tem uma vontade débil perante o chocolate.

She has a weak will when it comes to chocolate.

Vontade débil refers to low self-control.

1

A evidência apresentada pelo promotor é débil.

The evidence presented by the prosecutor is weak.

Common in legal and formal registers.

2

O sistema de segurança possui várias falhas débeis.

The security system has several weak flaws.

Débil characterizes the nature of the flaws.

3

A recuperação do paciente foi débil no início.

The patient's recovery was weak at first.

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